Improvement in valves



tuird gte/tre @anni (attire.

AUGUST SNYDER, or PITTSBURG, PENNSYLVANIA, ASSIeNoR To AT.

-woon e MCoArrIntr,` or SAME PLAGE.

Letters Patent No. 103,931, dated June 7, 1870.

IMPROVEMENT IN VALVES.

The Schedule referred to in these Letters Patent and making part of the same To all 'whom it may concern,-

Beit known that I, AUGUST SNYDER, of the city of Pittsburg, in the county of Allegheny `and State of Pennsylvania, have invented anew and useful method ot' constructing Steam-Valves or Stop-Cocks; and I hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawings making partof this specification.

The general principles and methods of constructing steam-valves or stop-cocks are so well known to all inanuicturers that no description need be given here ofthe parts not aifected .by my invention, which consists specially ofthe novel method of constructing and operating the valve of such stop-cocks.

I make these valves in two pa1ts,'A A', of any suit* able material, and in any convenient size or shape.

One of these 'parts or disks A I hang upon the collar l ofthe stem O by Incansof the arms a a. These are Iliade to fit around the collar b, and project sufiiciently beyond the center of the collar to hold'the other part or disk A, which is hung upon them.

On the inner surfaces of these disks A A', and nearu their centers, I form the lugs or projections B B', fitted to work against each other, and so regulated, as to size, that the disks A A may touch or nearly touch each other as they hang loosely by and from the arms a a. These lugs may be runde wedge-shaped and with iiat surfaces, but I generally make them of about one-i`ourth radius, and with concave and convex surfaces workingtogether, as shown in the drawings. Now, the two disks, A A', being suspended from the stem C in the manner I have described, it will be observed that the disk A hangs below the disk A an eighth of an inch or more, so that, when the valve is' closed, the

disk A will first reach its place and become fixed to its seat; the other disk A' being then pressed down by the stem C, the two disks are forced outward by the action of the lugs or projections upon each other, and fixed so firmly to their seats D D that neither steam nor liquid can escape.

One objection tothe use of at valves has been that the large-'surtces required to be brought together in closing the valve were liable to become scratched or out by the action of the steam or uid, so as to cause the valve to leak, and also that sand or other impurities coming between the surfaces prevented the valvel from closing tightly. This objection I obvate by forming on the face or outer surfaces ofthe disk A, a

brail,'c, of about an eighth of an inch in size, and a little larger in diameter than the hole which the valve is to close; as this disk comes rst toits seat, the stem G willfalways cover the hole and close the valve, while the pressure from'the other disk, in the manner described, will either crush or drive away any impurities from the small surface of the head, and, at the same time, will tend to close up any scratches or cuts made by the action ofthe steam or fluid.

Having thus described the nature and use of my invention,

What I claimas new, and desire to secure by Let ters' Patent, is

The lugs or projections B B' arranged upon the inner surface of the disks of the valve to move upon a single point of contact, all'as and for the purpose shown'and described.

AUGUST 'SNYDEIL Witnesses:

I. H. BALDWIN, W.' K. J ENNINGS. 

